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convertexa

3GP → MKV

3GP to MKV converter

convertexa converts 3GP files to MKV locally in your browser using a dedicated ffmpeg engine. Nothing is uploaded: the file is read, converted and handed straight back to you as a download.

  • Free, no sign-up
  • Nothing is uploaded
  • Works offline
Quality
Re-encoded
Runs
In your browser
Max input
300 MB
Status
stable

Drop a file to convert

Everything happens on your device — nothing is uploaded.

or paste with Ctrl+V

How to convert 3GP to MKV

  1. 1 Drop your 3GP file here.
  2. 2 Choose MKV as the output format and adjust the options.
  3. 3 Convert and download the result.

About 3GP and MKV

3GP is the legacy mobile format; MP4 keeps the same content and plays everywhere.

Matroska is a flexible container; MP4 is narrower but far more widely supported.

3GP files are read by the convertexa engine that ships with this page, so the conversion is identical whether you use this tool or the general converter. The output is produced with the same codec settings for every visitor, which means the same input always produces the same result.

Limitations

  • Re-encoding a lossy source cannot restore the quality that was lost when it was first encoded.

Frequently asked questions

How do I convert a 3GP file to MKV?

Add your 3GP file to the box above. convertexa detects the format from the file content, applies the 3GP to MKV conversion and gives you the result to download. The whole operation runs inside your browser.

Are my 3GP files uploaded anywhere?

No. The conversion runs in a sandboxed worker on your own device. Your file never leaves the browser, and nothing is stored on a server.

Is the 3GP to MKV conversion lossless?

No. MKV is a re-encoded format, so some data is discarded to reach the target format. 3GP is the legacy mobile format; MP4 keeps the same content and plays everywhere.

Is there a size limit?

For reliable results keep the input under 300 MB. Very large files run out of memory in the browser rather than failing quietly.

Which browsers are supported?

Any current version of Chrome, Edge, Firefox or Safari on a desktop. The conversion engines need WebAssembly and Web Workers, both of which are standard since 2018.